Hello,
I have a white iBook G3. But I have a problem with the installation. When I boot the install-powerpc-minimal-20120909.iso and type 'ifconfig' it only shows me the 'lo' interface. At 'net-setup eth0' it says 'Driver: gem'. I believe it is 'sungem'? I chose DHCP. But it didnt work. It shows only 'lo' at ifconfig.

I read somewhere that I need the 'bmac' driver. I dont know if it is true. How do I change it from 'gem' to 'bmac'?
I already did 'modprobe bmac'.

that shows that you have at least 2 network interfaces but none of them is up. if you now type lspci -k it will show you which driver is attached to each device.
im just guessing, but eth0 might be the wlan interface and eth1 the ethernet one so that it would just as easy as using gentoos net-setup script to configure eth1.